build(packaging/macos): update macports cxx standard to 2020

[ReenigneArcher]

Description

Update cxx standard in macports file to 2020.

Screenshot

Issues Fixed or Closed

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency update (updates to dependencies)
• Documentation update (changes to documentation)
• Repository update (changes to repository files, e.g. .github/...)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the in code docstring/documentation-blocks for new or existing methods/components

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 7.87%. Comparing base (d50611c) to head (96368e0).

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #3505   +/-   ##
======================================
  Coverage    7.87%   7.87%           
======================================
  Files          90      90           
  Lines       15803   15803           
  Branches     7487    7487           
======================================
  Hits         1244    1244           
  Misses      12133   12133           
  Partials     2426    2426           

Flag	Coverage Δ
Linux	8.42% <ø> (ø)
Windows	5.36% <ø> (ø)

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